Discussions about economic systems in general are mostly about how to optimize efficiency (re "Misallocation of resources"). But we could say the problem is that today's global economy has already become too efficient.
That's why people like Bernard Lietaer do propose dual currency systems. There'd be "patriarchical" currencies for long distance trading (Bitcoin would be among the best we ever had in this regard), and local currencies.
http://www.scribd.com/tesasilvestre/d/34659324-The-Monetary-Blind-Spot-by-Bernard-Lietaer
All patriarchal societies in history have had the tendency to impose a monopoly of a single currency, hierarchically issued, naturally scarce or artificially kept scarce, and with positive interest rates. This was for instance the case in Sumer and Babylon, in Greece and Rome, and from the Renaissance onwards in Western societies all the way to today. The form of these currencies has varied widely, ranging from standardized commodities, precious metals, paper or electronic bits. But what they all have in common is that governments accepted only that specific currency for payment of taxes, that this currency could be stored and accumulated, and that borrowing such currencies implied payment of interest. [...]
Matrifocal Societies
In contrast, matrifocal societies have tended to use a dual currency system: one currency (typically identical to the surrounding patriarchal societies) for trading long distance with people one doesn’t know; and a second type of currency for exchanges within one’s own local community. This second type of currency, with Yin characteristics, was usually created locally (often by the users themselves); was issued in sufficiency; and didn’t have interest. In the most sophisticated cases, this currency even had a demurrage fee - a negative interest equivalent to a parking fee on money -, which would discourage its accumulation. In short, it would be used as a pure medium of exchange, not as a store of value. This was the case, for instance, with the corn-backed currencies that lasted for well over a millennium in Dynastic Egypt that was one of the secrets of the wealth of that ancient society.
http://www.scribd.com/doc/26248658/Is-Our-Monetary-Structure-a-Systemic-Cause-for-Financial-Instability-Bernard-Lietaer
Sustainability curve mapped between the two polarities of efficiency and resilience. Nature selects not for a maximum of efficiency, but for an optimal balance between these two requirements. Notice that resilience is roughly two times more important than efficiency at the optimum.